[PATCH v2 0/3] Bluetooth: btmtksdio: teardown fixes

[Sergey Senozhatsky]

This is v2 of teardown fixes.

We noticed a number of cases when btmtk close/teardown would hung:

     INFO: task kworker/u17:0:189 blocked for more than 122 seconds.
     __cancel_work_timer+0x3f4/0x460
     cancel_work_sync+0x1c/0x2c
     btmtksdio_flush+0x2c/0x40
     hci_dev_open_sync+0x10c4/0x2190
     [..]

There are several issues with the teardown (close/reset) code
in the driver.  First, the btmtksdio_txrx_work() potentially
can spin forever (infinite loop).  Second, close/flush can
deadlock when run concurrently with btmtksdio_txrx_work().

v1 -> v2:
- added two more patches (deadlock fix, interrupts re-enabling
  enhancement)

Sergey Senozhatsky (3):
  Bluetooth: btmtksdio: correct btmtksdio_txrx_work() loop timeout check
  Bluetooth: btmtksdio: test for bug IO errors in btmtksdio_txrx_work()
  Bluetooth: btmtksdio: call cancel_work_sync() outside of host lock
    scope

 drivers/bluetooth/btmtksdio.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

-- 
2.54.0.1136.gdb2ca164c4-goog